{"uid":"cap_6ChHqSBxVz3NGOFo7bz1N","slug":"signalharness-prompt-diff-analyzer-7cfd833b","name":"SignalHarness Prompt Diff Analyzer","description":"Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.","url":"https://signalharness.ai/api/agent/services/prompt_diff_analyze/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"request_json":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Verify the caller-supplied data before relying on this result."],"service_id":"prompt_diff_analyze","analysis_json":"{\"example\":\"schema-valid caller-supplied data\"}","evidence_scope":"caller_supplied_data"},"status":"succeeded","receipt":{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","usage":[],"status":"succeeded","network":"eip155:8453","artifacts":[],"endedAtMs":0,"latencyMs":0,"paymentId":"example-payment","receiptId":"example-receipt","requestId":"example-request","serviceId":"prompt_diff_analyze","executionId":"example-execution","startedAtMs":0,"amountAtomic":"10000","resultSha256":"df7ddac984cce5812235b704d5530b3240c3d3cd6382bac0fc3a807551965456","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Urm8Jy0KByfwwDpg3n2-g","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes differences and changes between two prompt versions or prompt-related JSON structures, returning structured analysis results.","exampleAgentPrompt":"Can you diff these two versions of my system prompt and tell me what changed? Here's the JSON: {\"before\": \"You are a helpful assistant.\", \"after\": \"You are a helpful, concise assistant. Do not use bullet points.\"}","exampleUseCases":[{"title":"Audit prompt changes before deployment","prompt":"I updated my customer support agent's system prompt and want to make sure I understand all the differences before pushing to production — can you analyze this diff JSON and flag anything significant: {\"v1\": \"Be polite and helpful.\", \"v2\": \"Be polite, helpful, and always ask clarifying questions before answering.\"}?"},{"title":"Track prompt iteration history","prompt":"I've been iterating on my RAG prompt and have two versions saved as JSON — can you analyze what changed between them and summarize the key differences in behavior I should expect?"},{"title":"Quality check for prompt refactoring","prompt":"My team refactored our prompt template and I need to verify the changes are purely cosmetic and don't alter the intended instructions — please analyze this request JSON showing both old and new versions and flag any semantic differences."}],"resultDescription":"Returns a JSON object containing an analysis_json field with the structured diff or analysis results, a warnings array (e.g. reminders to verify caller-supplied data), the service_id, and an evidence_scope indicator. Also includes a full receipt with payment metadata (paymentId, receiptId, network, amountAtomic, resultSha256) and execution timing details.","failureModes":["Malformed or invalid JSON in request_json field returns an error","Input string shorter than 2 characters or longer than 65536 characters is rejected","Missing required request_json property causes validation failure","Payment failure on x402 network prevents execution","Caller-supplied data that cannot be parsed as valid prompt diff structure may yield unreliable analysis with warnings"],"whenToPreferThis":"Choose this endpoint when you need a quick, pay-per-call ($0.01 USDC) analysis of prompt differences without standing up your own diff infrastructure. Ideal for AI agent workflows that need to programmatically audit, compare, or validate prompt changes in a structured JSON format. Prefer this over manual diffing when the output needs to be machine-readable and traceable via receipt.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T07:03:07.923Z","isFirstParty":false}